@newyorkny2015 makes some great points. I'm 5'9" and 320, and that takes me completely off the racks of most major stores. I've got a long torso (all belly!) and shorter legs, so it's hard to coordinate.
I find that most stores like Casual Male/DXL won't have pants that work for me. They assume that if you are big in the waist, that you must be big AND tall, so the rises are impossibly long. If I try long rise + pleats? That makes me look like I'm wearing a very big, puffy adult diaper. And the hem at the bottom is always super wide, because again, they assume that big waist = ankle/calf circumference is huge, too.
I actually wouldn't mind paying a few extra bucks for something if it was at an extended size - if major stores borrowed the Wal-mart model (where extended sizes are more.) But what really gets me angry is how many stores refuse to carry any bigger sizes IN store. Old Navy was the worst example of this - basically, you were paying $8-10 (shipping) for the privilege of trying on an item that may or may not fit. Eddie Bauer and many other stores are the same way.
This also got way worse post 2009-2010 (economic downturn) where a lot of struggling stores (Sears, Eddie Bauer) reduced or eliminated their big sections in store. Sears eliminated a lot of sizes about XXL, and EB did too. JCP was a beacon in the darkness for a while, but they too have slipped, and seldom have availability for anything in-store or online.
I want something simple and contemporary or classic. I don't need runway looks, but there seems to be three choices these days:
(A) 20 different colors of pocket t-shirts (cigarettes not included)
(B) Bad, loud stripey preppy country club wear in every pastel color imaginable
(C) The "Tony Soprano's henchmen" line, with velour trackpants and jacket